/*
 * (c) 2008-9 Jason Frame
 * Auxiliary element code based on work by pjesi (http://wtf.hax.is/)
 */
( function($) {

	/**
	 * Initialise input hints on all matched inputs.
	 *
	 * Usage examples:
	 *
	 * Add hints to all inputs with the 'title' attribute set:
	 * $('input[title],textarea[title]').inputHint();
	 *
	 * Add hints to all matched elements, grabbing the hint text from each element's
	 * adjacent <kbd/> tag:
	 * $('input').inputHint({using: '+ kbd'});
	 *
	 * Options keys:
	 * using: jQuery selector locating element containing hint text, relative to
	 * the input currently being considered.
	 * hintAttr - tag attribute containing hint text. Default: 'title'
	 * hintClass - CSS class to apply to inputs with active hints. Default: 'hint'
	 */
	$.fn.inputHint = function(options) {

		options = $.extend( {
			hintClass : 'hint',
			hintAttr : 'title'
		}, options || {});

		function hintFor(element) {
			var h;
			if (options.using && (h = $(options.using, element)).length > 0) {
				return h.text();
			} else {
				return $(element).attr(options.hintAttr) || '';
			}
		}

		function showHint() {
			if ($(this).val() == '') {
				$(this).addClass(options.hintClass).val(hintFor(this));
			}
		}

		function removeHint() {
			if ($(this).hasClass(options.hintClass))
				$(this).removeClass(options.hintClass).val('');
		}

		this.filter( function() {
			return !!hintFor(this);
		}).focus(removeHint).blur(showHint).blur();

		this.each( function() {
			var self = this;
			$(this).parents('form').submit( function() {
				removeHint.apply(self);
			});
		});

		return this.end(); // undo filter

	};

})(jQuery);